Nearly half of the flights that touched the Chatrapati Shivaji International Airport (CSIA) runway were delayed in December due to a chain reaction of previous delays and other errors by airlines, a CSIA report showed on Monday.

Out of the 9,103 flights that departed and 9,081 arrivals from CSIA, 45% departures and arrivals were delayed, the data from CSIA showed.

Air India (flight code AI) had the highest percentage of flights delay in the month of December, for both departures and arrivals at CSIA. This was followed by Indigo for 50% delays in departures and GoAir for 50% delays in arrivals.

For the national carrier a total of 1330 Air India (AI) flights that took off from the airport, 50% departures were delayed and and 65% of the 1323 arrivals were not on time.